This is absolutely amazing.
Alzheimer's is a horrible disease that steals everything you love about a person.
There's a new documentary called Alive Inside where people use a person's favorite music to bring them back from the nothingness of Alzheimer's.
It is incredible to see a man who was basically in a trance, be able to look at people and answer questions just after listening to some of his favorite songs.
Check out the video (above) to see the true power of music.